dreaded p0300 code
Thread Starter
Pro
Joined: Jan 2008
Posts: 642
Likes: 48
From: New Jersey
dreaded p0300 code
got an '11 Z06 with CAI, Magnaflow exhaust and an Intune canned tune. Been running great for 3+ years. Changed the oil 2 weeks ago and when i started it up I got the P0300 code. It went away after 3 engine starts. But a couple days later it came back. Now 5-6 engine starts its still there. My question is whats a good way to troubleshoot without having to buy an expensive scan tool. I have the Diablo Intune and also an OBD dongle. I downloaded a couple apps for my Adroid tablet. Torquelite and I've been using OBDLink to monitor engine stuff. Whats a good app to analyze whats setting the code?
Instructor
Joined: Oct 2014
Posts: 193
Likes: 4
From: Mass
Same thing happened with my 05'. Check the spark plug wires. Make sure there all clicked on the coils and plugs. One of my spark plug wire felt a little loose on the coil. I pushed it back on and the code has not come back on. Good luck.
Supporting Vendor
Joined: Aug 2007
Posts: 1,452
Likes: 86
From: CT
plugs, plug wires, coils...
make sure no cracked plugs.. and no loose plugs..
make sure wires are all fully snapped on to the plugs/coils..
clean your MAF sensor..
make sure no cracked plugs.. and no loose plugs..
make sure wires are all fully snapped on to the plugs/coils..
clean your MAF sensor..
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS LS3, short-throw shifter, NPP perf. exhaust, BMR strut-tower brace, Cold Air Inductions cold air intake, catch-can, ported/polished TB, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS LS3, short-throw shifter, NPP perf. exhaust, BMR strut-tower brace, Cold Air Inductions cold air intake, catch-can, ported/polished TB, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Thread Starter
Pro
Joined: Jan 2008
Posts: 642
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From: New Jersey
I've only got 5000 miles on the car. Seems unlikely to be plugs. Besides wouldn't there be a code that pinpoints the offending cylinder? I'll check everything out. Just seems strange this came on right after changing the oil. I cleaned the MAF two years ago when I took out the K&N air filter which is oiled. I switched to a non-oiled AirRaid. I remember taking readings before and after. The gms/sec at idle dropped from 11 to 9.
Last edited by 548chevelle; Jul 1, 2016 at 08:56 PM. Reason: ad info
Thread Starter
Pro
Joined: Jan 2008
Posts: 642
Likes: 48
From: New Jersey
I was using a set of Taylor 10.5mm plug wires. So I figured I would go back to the stock set. The Taylors are very difficult to seat on the plugs. I think two were not fully seated. But I continued replacing them with the stock set. Also figured I'd check the plugs. WTF! They were all gapped from the factory at .035. Supposed to be .040 so I did that. Started engine and no code. Drove it 3 different times today still no code. I'll wait a week or two and go back to the Taylors and see what happens,
